body {
	/* 背景图片 */
	background: url(../img/bg.jpg) no-repeat center center fixed;
	background-size: cover;
}

.main {
	width: 100vw;
	height: 100vh;
	/* flex容器, 水平居中, 垂直居中 */
	display: flex;
	justify-content: center;
	align-items: center;
}

.login {
	width: 50vw;
	height: 50vh;
	border: 5px solid #FF6600;
	border-radius: 10px;
	/* 背景色为白色, 半透明 */
	background-color: rgba(255, 255, 255, 0.7);
}
